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Chapter 1 MINERALS SECTION I

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Chapter 1 MINERALS SECTION I Chapter 1 MINERALS SECTION I: INTRODUCTION From the perspective of a gemologist a mineral is an exciting thing! Most gems are minerals and minerals even in their natural form can be quite beautiful and valuable. But what is a mineral, and how do we distinguish it from other substances? A simple definition of a mineral is that it is a naturally occurring inorganic (never living) solid with a definite internal arrangement of atoms (crystal structure) and a chemical formula that only varies over a limited range that does not alter the crystal structure. In our world there are many crystalline substances; sugar forms crystals and is formed by organic processes such a photosynthesis. Salt (NaCl, sodium chloride) or as geologists call it, halite, is usually precipitated from evaporating water without organic processes and is thus a mineral. Figure 1. Shown above are the crystal structure (magnified and expanded) of the minerals, Halite (NaCl) and of two carbon minerals, graphite and diamond. The lined between atoms represent chemical bond. The structure of minerals and their bonding make a lot of the difference in the minerals’ properties, for example hardness. Very few things that are solid are not crystalline. However, because in our world much of what we see is formed by life processes, most observed solids are not minerals. You will quickly argue that rocks are all around us and that they are made of minerals, however in terms of variety only about a dozen minerals (the rock forming minerals) are abundant and in fact there is a great deal more variety of organic solids around us than minerals. We rarely spend much time observing minerals and really the average beginning student knows almost nothing about them and their properties. There are around 4,000 known species of minerals and most of them are extremely rare. Of the few inorganic, non-crystalline solids dealt with in gemology, glass is the most important. Glass forms by rapid cooling of substances that have been melted to a liquid. There are natural and man-made glasses. Man made glass is often used as a gem substitute or simulant and should be suspected at all times. Figure 2 on the next page shows an organized mineral structure 1 with an ordered arrangement of atoms and a disorganized substance without a crystal structure. Both can be solid, but a disorganized solid is called non-crystalline or amorphous. Figure 2. Crystalline and amorphous solids. Both are held by chemical bonds, but crystalline solids have an ordered structure that fills space in 3 dimensions. You can predict where the next atom can be found in the structure. As with glass, resins and plastics of organic origin, such as natural amber and man-made epoxy and acrylic, also lack crystalline properties and should also be watched for in jewelry. They are usually low density and have much lower melting points than most glasses. However, many organic substances, such as sugars have a crystalline structure. Rarity is one of the qualities that a gem must posses. A rock forming mineral shares many attributes with a gem, but rarity is not one of them. However, the rock forming minerals often are the reason for gems’ rarity because they “dilute” the gems and enclose them; because of the rock forming minerals abundance, it is hard to find gems. Some rock forming minerals can reach gem quality, if they have the required properties of a gem. Normally the mineral quartz is not a gem, but there are varieties that are gems, mainly because of their beautiful color and clarity. A gem must have at least 3 properties, 1) Beauty, 2) Durability, and 3) Rarity. Many beautiful minerals are collector specimens because of their pleasant shape (usually a crystal form), color, and size. Collectable minerals overlap with the field of gemology, but are not synonymous. When it comes to rarity, consider a gravel or large quantity of rock that has only 1 gram of diamond per 10 million grams of other minerals. This quantity of gems per volume of rock is still economic and explains the cost of gemstones based on rarity. Beautiful crystal may also be rare, but not necessarily gems and thus have value for another reason. To find these valuable gems, their unique properties must be recognized and exploited. The basic minerals should be recognized and understood so that their context to the gem minerals can be interpreted. Finding a gem mineral requires looking in the right place, and finding the right type of rocks requires recognizing the rock forming minerals and thus identifying rocks. SECTION II: IDENTIFYING ROCK FORMING MINERALS PURPOSE In this exercise we will examine common rock forming minerals and attempt to identify some 2 unknown minerals by testing them. We will study some of their physical properties and learn simple tests that can be applied to distinguish minerals. Some of these test have value when testing gem substances in their rough form, but few of these test should be applied to cut gemstones. WHAT WE WILL DO IN THIS LAB We will do simple tests, but even these can be done with considerable precision if practiced. Since minerals are the building blocks of most rocks, what we learn today, will be applied to recognizing rocks and gem materials in future laboratories. 1) identification of unknown minerals fragments in trays based on physical properties (1 hr.) 2) identify crystal shapes on ideal specimens (10 minutes; done with your group) 3) relate shape to the crystalline structure of minerals (10 mins.; done with your group) 4) observe crystal structures of the 7 crystal systems using models and natural crystals (10 mins.) 5) look at X-rays of minerals (slide show, 10 minutes) 6) observe some noncrystalline solids (10 minutes; done with your group) METHODOLOGY and PROCEDURES A systematic (logically ordered) testing of unknowns and reference to mineral identification tables will allow us to make educated guesses as to the identity of the unknowns in project 1 (identification of mineral fragments). For these exemplar minerals, extreme quantitative (numerical) precision will not be necessary, but careful recording of results and observations are essential. The student should become familiar with the tests described below (see Review Questions and terminology at the end of the chapter). The order in which the tests are done should be based on the data tables used (see next section). Not all tests are necessary or need be applied. The goal of the tests is to get enough characteristic results to slowly separate a large pile of minerals into smaller and smaller piles, and ultimately individual identified samples. Of course, this may take several steps. The instructor will give you a list of numbers corresponding to the labeled minerals in our trays of mineral fragments you will test from your trays. Most of these are broken pieces not crystals. Write the list of mineral numbers here: 3 1) Luster– Luster is the effect created by light reflecting from the mineral’s surface. The most important types are 1) metallic luster and 2) non-metallic luster. Dull and earthy luster is often grouped with metallic luster, which will do today. Though these two groupings are enough for common minerals. More specific types of luster terminology important to gemstones include: Adamantine (like a diamond), Chatoyant (such as cat’s eye), Greasy, Pearly, Silky, Resinous (like amber or polyurethane), Vitreous (looking like glass, a good example is clear quartz), and Waxy. Gemstone luster will be carefully examined in a later laboratory, but demonstration examples will be displayed in room today. Step 1 Separating minerals by luster You have been given a box of minerals. Separate them into the groups Metallic, Earthy or Dull, and Nonmetalic. Record the mineral numbers in the boxes below. Metallic Earthy or Dull Nonmetalic Demonstrations of Special Lusters Special Characters Related to Luster are demonstrated at the front or side of the room. Familiarize yourselves with–Chatoyancy is the character of having a fibrous texture as seen in tiger’s eye. Tiger’s eye has fibers embedded in quartz and has a strong chatoyancy, but other minerals such as tourmaline and cat’s eye chrysoberyl also show this. Schiller is best seen in labradorite feldspar that varies in color as the mineral is moved and looks like the wings of some iridescent butterflies. Labradorite makes an attractive building material and semiprecious stone. Schiller is also seen in some gems such as moonstone. Pearly luster as seen in the mineral ulexite(sometimes called the TV stone). Greasy luster as in some chalecedony, a type of microcrystalline(also called cryptocrystalline) quartz. Glassy luster as seen in broken glass, and resinous luster as seen in amber (a fossilized tree resin; not a mineral) Put the correct numbers and your assumed names for the samples base on their luster. Chatoyancy Schiller Pearly Greasy Glassy Resinous 2) Color– Color is how a mineral looks in reflected light. If the mineral is transparent this too can be noted. See what color most closely matches those used in the descriptions of minerals, 4 but also note that there may be considerable variation. For instance, quartz occurs in many colors such as colorless, milky, rose, smokey, purple (amethyst), and yellow (citrine) and also varies from transparent to translucent (not allowing much light to pass through). Geologically, iron-rich, dark colored minerals are separated from iron-poor, light colored minerals. This distinction creates two separate subdivisions and speeds identification. It is also logical because most rocks are classified by the percentages of these lighter and darker minerals. Dark colored minerals are sometimes called ferromagnesian mineral (rich in iron and magnesium).
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